單項選擇題The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）

A.greater than the average exhaust manifold pressure
B.less than the average exhaust manifold pressure
C.greater at the turbine wheel than at the impeller
D.greater at reduced engine speed


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1.單項選擇題A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）

A.loss of additives from the lube oil
B.carbon deposits in the lube oil
C.excessive centrifuging
D.excessive fuel dilution

2.單項選擇題Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）

A.erosion and cratering of the nozzle orifices
B.fuel leakage into the nozzle drain line
C.fuel leakage before and after injection
D.insufficient fuel delivery though that nozzle

3.單項選擇題Diesel engine cylinder head test cocks are used to （）

A.check cylinder lubrication
B.connect the pressure indicator pressure
C.test cylinder heads
D.connect the exhaust gas pyrometers

4.單項選擇題Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）

A.At zero load the intake manifold pressure is greater than the exhaust manifold pressure
B.At full load the intake manifold pressure and exhaust manifold pressure are equal
C.At full load the intake manifold pressure is less than the exhaust manifold pressure
D.At full load the intake manifold pressure is greater than the exhaust manifold pressure

5.單項選擇題Lubricating oil viscosity in an operating diesel engine can be reduced by（）

A.increasing cooling water flow
B.increasing lube oil flow
C.dilution by fuel oil
D.adding SAE 70 oil